We visited a fish market in Busan (Jagalchi market). During our visit, an octopus attacked me.

(What a summer. I've been attacked by lobsters. See here. And Sejin. See here and here. And now an octopus.)
Later that day we went hiking in a nice place. Here's one picture, and here's another.
After that, we ate at a traditional-style restaurant.
(After that, dad and I returned to Seoul via KTX, a high-speed train.)